<template>
  <view class="search-box">
    <!-- 基本用法 -->
    <uni-search-bar @input="input" :radius="100" cancelButton="none" focus="always"></uni-search-bar>
    <!--搜索建议列表-->
    <view class="sugg-list">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box">
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: "",
        //搜索的结果
        searchResults: [],
        // 搜索关键词的历史记录
        historyList: []
      };
    },
    onLoad() {
     this.historyList=JSON.parse(uni.getStorageSync("kw") || '[]')
    },
    methods: {
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        if (this.kw === '') {
          this.searchResults = []
          return
        }
        const {
          data: res
        } = await uni.$http.get('https://api-hmugo-web.itheima.net/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        // 判断是否获取失败
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      gotoDetail(item) {
        uni.navigateTo({
          url: "/subpkg/goods_detail/goods_detail?goods_id=" + item.goods_id
        })
      },
      saveSearchHistory(){
        this.historyList.push(this.kw)
        const set=new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        uni.setStorageSync("kw",JSON.stringify(this.historyList))
      },
      cleanHistory(){
       uni.setStorageSync("kw",'[]')
       this.historyList=[]
      },
      gotoGoodList(item){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query='+item
        })
      }
    },
    computed:{
      histories(){
        return[...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    //设置位置吸顶
    position: sticky;
    //吸顶的位置
    top: 0;
    //提高层级，防止被轮播图覆盖
    z-index: 999;
  }

  .sugg-list {
    padding: 0 5px;

    .sugg-item {
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;

      .goods-name {
        // 文字不允许换行（单行文本）
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  .history-box {
    padding: 0 5px;
  
    .history-title {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 40px;
      font-size: 13px;
      border-bottom: 1px solid #e3e3e3;
    }
  
    .history-list {
      display: flex;
      flex-wrap: wrap;
  
      .uni-tag {
        color: black;
        background-color: #e3e3e3;
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
